Recordkeeping and deductible expenses for small businesses
If you run a sole proprietorship, Schedule C is where you report your business income and most business expenses on your personal return. Good recordkeeping and correct categorization of deductions not only make tax filing easier — they’re the foundation for surviving an IRS audit and keeping more of what you earn. This article gives practical, IRS-backed guidance on what records to keep, the common deductible expense categories on Schedule C, and frequent pitfalls to avoid.
Why records matter (short version)
The IRS expects you to be able to substantiate amounts reported on Schedule C; the burden of proof is yours. Publication 334 explains that good records help you prepare returns, identify deductible expenses, support entries on returns, and monitor your business performance. (Pub. 334)
The IRS’s Recordkeeping guidance says keep records “as long as needed to prove the income or deductions on a tax return” and gives types of documents examiners commonly request (receipts, canceled checks, logs, invoices). Organize by year and type (income, expenses). (Recordkeeping; Audits Records Request)
What records to keep — practical checklist
Gross receipts: sales invoices, deposit slips, receipts, POS reports, Forms 1099 you receive. (What kind of records should I keep)
Business expenses: receipts, paid invoices, canceled checks or bank/credit‑card statements that show payee, amount, date, and business purpose. (What kind of records should I keep)
Asset records: purchase contracts, closing statements, invoices for equipment, records of improvements, depreciation schedules, Form 4562 entries. Keep until the period of limitations expires after disposition. (What kind of records should I keep; Publication 334)
Vehicle records: contemporaneous mileage log (date, miles, business purpose, starting/ending odometer), or supporting evidence if you use the standard mileage rate. (Pub. 463; Topic 510)
Travel and meal substantiation: receipts for lodging and transportation, receipts for meals (where required), dates, locations, business purpose, who attended and business relationship — the elements required under section 274 and Treas. Reg. § 1.274‑5. (§ 274(d); Treas. Reg. § 1.274‑5T / § 1.274‑5A)
Employment and payroll records: W‑2s, Forms 941/940, payroll registers — keep at least four years. (Recordkeeping)
Summary bookkeeping: a simple profit & loss summary or accounting ledger tying all documents together makes audits far less painful. (Recordkeeping)
Deductible expense categories commonly used on Schedule C
Cost of goods sold (COGS)
If your business buys inventory or raw materials for resale, report purchases and compute COGS (Schedule C, Part III). Maintain purchase invoices and inventory records. The 10% basis and inventory rules in the tax rules matter if you carry inventory or use uniform capitalization rules. (Instructions for Schedule C; Pub. 334)
Advertising and marketing
Ordinary and necessary costs to promote your business are deductible under § 162 and the regulations. Keep invoices, ad copy, and contracts. (IRC § 162; Treas. Reg. § 1.162‑1)
Car and truck expenses
Two methods: standard mileage rate (for 2025, 70¢/mile—see Schedule C instructions and Pub. 463) or actual expenses (fuel, repairs, depreciation, insurance) allocated to business use. You must substantiate business miles with a contemporaneous log; IRS Topic 510 and Pub. 463 explain requirements and limits. If you use actual expenses and claim depreciation or a section 179 deduction, special rules and limits apply. (Pub. 463; Topic 510; Instructions for Schedule C)
Travel, meals, and entertainment
Travel (transportation, lodging) while away from home on business is deductible if properly substantiated. Meals are generally 50% deductible (with limited exceptions); entertainment deductions are largely disallowed. Section 274(d) and the substantiation regs require you record amount, time/place, business purpose, and business relationship of persons entertained. Use Pub. 463 for rules and the IRS substantiation standards. (§ 274; Treas. Reg. § 1.274‑5T / § 1.274‑5A; Pub. 463)
Rent and utilities (business premises)
Rent paid for business space and business utilities are deductible. Home‑office deductions are separate (see below). Keep lease, canceled checks, and utility bills. (IRC § 162; Pub. 334; Pub. 587)
Business use of home (home office)
If you use part of your home exclusively and regularly for business and it is your principal place of business, you may deduct a portion of home expenses. You can use the simplified safe harbor ($5 per square foot up to 300 sq ft) or the regular method (Form 8829). Follow the exclusive‑use and principal‑place rules closely; Pub. 587 and Topic No. 509 explain them. (Pub. 587; Topic 509)
Insurance and employee wages
Premiums for business insurance (liability, professional liability) and payroll (wages, employer payroll taxes) are ordinary deductions. Keep payroll records and Forms W‑2/W‑3. (IRC § 162; Recordkeeping; Pub. 334)
Interest and bank fees
Interest on business loans is deductible to the extent allocable to the business. Keep loan statements and proof of business use. (IRC § 163; Instructions for Schedule C)
Supplies, repairs, and maintenance
Ordinary supplies and repairs that don’t add to basis are deductible. Capital improvements generally are capitalized and depreciated. (Treas. Reg. § 1.162‑1; Pub. 334)
Depreciation and section 179
Large purchases of equipment are usually capitalized and recovered over time via depreciation (Form 4562). For qualifying property placed in service, section 179 expensing and bonus depreciation may apply (see Form 4562 instructions and Schedule C instructions). Keep purchase invoices and asset records. (Instructions for Schedule C; Pub. 334; Form 4562)
Professional fees and legal
Fees to attorneys, accountants, and other professionals are deductible if ordinary and necessary to the business. Keep invoices detailing the services. (IRC § 162; Treas. Reg. § 1.162‑1)
Taxes
State and local business taxes, sales taxes (when applicable), and business real estate taxes are deductible (with exceptions). Employment taxes have separate reporting rules. Retain tax notices and payments. (Pub. 334; Recordkeeping)
Common pitfalls and how to avoid them
Missing or late documentation. The IRS expects adequate records; section 274(d) rejects approximations for travel, meals, gifts, and listed property unless you have adequate records. Maintain contemporaneous logs and receipts. (§ 274(d); Treas. Reg. § 1.274‑5T / § 1.274‑5A)
Treating personal expenses as business. Be strict about exclusive business use: mixed personal/business items need careful allocation and documentation. The home‑office rules require exclusive and regular use. (Pub. 587; Topic 509)
Relying on memory or rounded numbers. Schedule C entries in round numbers are a red flag in audits and for EITC due diligence. Reconstruct records when originals are lost, but document assumptions and methods. (EITC due diligence and Recordkeeping guidance; Recordkeeping)
Misclassifying rental activities. Rental real estate usually belongs on Schedule E unless you provide substantial services — then Schedule C may be appropriate. Use Topic No. 414 and Pub. 527 for guidance. (Topic 414; Pub. 527)
Incorrect vehicle method selection. If you take depreciation or section 179, you may be barred from using the standard mileage rate in later years for that vehicle. Choose carefully and document consistently. (Pub. 463; Topic 510)
Overclaiming meals/entertainment or gifts. Section 274 sets a $25 limit on gifts to any individual and strict substantiation for gifts and business meals; entertainment deductions are mostly disallowed. (IRC § 274; Treas. Reg. § 1.274‑5)
Failing to meet due diligence for EITC returns with Schedule C. If you prepare returns that claim EITC and include Schedule C activity, you must make reasonable inquiries and document them when the business figures look inconsistent or suspicious. (EITC due diligence and Recordkeeping guidance)
Practical tips that save time and risk
Digitize receipts and back them up. The IRS accepts electronic records if they’re reliable. Keep source documents that support summaries. (Recordkeeping)
Keep a separate business bank and credit‑card account. That single step greatly simplifies matching receipts to transactions. (What kind of records should I keep)
Use a simple bookkeeping summary (monthly P&L) that ties to receipts. If you’re audited, a neat summary plus source docs shortens the examination. (Recordkeeping; Audits Records Request)
Maintain contemporaneous mileage logs (date, miles, purpose, start/end odometer). If you use the standard mileage rate, you still need to prove business miles. (Pub. 463; Topic 510)
If you don’t have full records, reconstruct them using partial records (bank statements, appointment calendars, invoices) and document your reconstruction method. The IRS recognizes reasonable reconstruction when properly documented — but be cautious and transparent. (Recordkeeping; EITC record reconstruction guidance)
For meals and travel, always note the business purpose and the business relationship of attendees at the time of the expense — this is required under § 274(d) substantiation rules. (IRC § 274; Treas. Reg. § 1.274‑5T / § 1.274‑5A)
If (or when) the IRS asks for documents
The IRS’s audit/records request guidance tells you to send copies (not originals), organize them by year and category, and include a summary. The notice will instruct how and when to present records; follow it. (Audits Records Request)
Produce contemporaneous logs and receipts first — these are what examiners look for. If you reconstructed records, provide a clear explanation and the supporting evidence used for reconstruction. (Audits Records Request; Recordkeeping)
Bottom line Treat recordkeeping as part of running your business, not as a tax-year chore. Keep receipts, contemporaneous logs for travel and vehicle use, clear summaries, and separate business accounts. Use the IRS publications (Publication 334, Pub. 463, Pub. 587, Publication 583) and Schedule C instructions when you categorize expenses. When in doubt about whether an expense is ordinary and necessary, document your business purpose and consult the Schedule C instructions or a trusted tax professional — and if you prepare EITC claims, follow the added due‑diligence rules for self‑employment income.